NEET 2012 Chemistry question

Not in JEE Main or NEET syllabus

The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resins follows the order:

(1)
(2)
(3)Correct
(4)

Answer: (3)

Solution

In water the alkali metal ions are hydrated, and the extent of hydration depends on ionic size: the smaller the bare cation, the higher its charge density and hydration energy, so the hydrated radius follows (ionic radii increase in the opposite order,

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Question ID VK-091113